Effects of Fe substitution on Mn2Sn alloy on its structural, magnetic and magnetocaloric properties

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:505

Article

Felez, Marissol R.¹  Monteiro, Jose Carlos B.^1,4  de Florio, Daniel Z.²  Gandra, Flavio C. G.¹  Gama, Sergio³ 

[1] Univ Estadual Campinas, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP, Brazil

[2] Univ Fed ABC, Ctr Engn Modelagem & Ciencias Sociais Aplicadas, BR-09210580 Sao Paulo, SP, Brazil

[3] Univ Fed Sao Paulo, Dept Ciencias Exatas & Terra, BR-09910720 Diadema, SP, Brazil

[4] Univ Fed Maranhao, CCSST, BR-65900410 Imperatriz, MA, Brazil

关键词: Magnetic measurements;    Biphasic material;    Layered material;    Magnetic refrigeration;    Thermomagnetic motors;   

DOI  :  10.1016/j.jmmm.2020.166676

来源: Elsevier

【 摘 要 】

The effects of Fe substitution on Mn site of Mn2Sn compound was investigated by means of scanning electron microscopy with X-ray energy dispersive spectrometer, X-ray diffraction, magnetization and magnetocaloric measurements. The produced Mn2-yFeySn series (0.50 <= y <= 1.75) presented two phases, a major non-stoichiometric Mn2-xSn and a minor Mn3Sn, respectively, with Fe content replacing Mn in each phase. The lattice parameters a and c of Mn2-xSn and Mn3Sn phases decrease approximately linearly with Fe concentration while their transition temperatures increase covering a wide temperature range from 177 K to 546 K (major phase T-C1) and 260 K to 704 K (minor phase T-C2) resulting in alloys with two distinct values of T-C. The magnetization measurements show a ferromagnetic coupling and saturation magnetization increases along the series. The heat flux analyses determined second order of magnetic transitions and magnetocaloric effect was calculated with vertical bar Delta S vertical bar around 1 J/kg.K. The cooling power was estimated in 85 J/kg. Both values were for mu(0)Delta H = 2 T. Thereby, for technological devices which have their efficient improved using layered materials, Mn2-yFeySn alloys are valid candidates since the association of its properties allow to yield a powerful magnetic and magnetocaloric material, and, besides, they are low cost, non-toxic, absent of rare-earth and easy to manufacture.

【 授权许可】

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